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Investments - Real Estate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Real estate |  |  |
Depreciation expense on invested real estate | $ 69.5 | $ 69.9 | $ 66.1
Accumulated depreciation on invested real estate | $ 925.2 | $ 749.6 |

X
- Definition Amount of depreciation expense on real estate for the period. + References No definition available. + Details
Name: | pfg_RealEstateDepreciationExpense
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount as of the balance sheet date of accumulated depreciation pertaining to invested real estate. + References No definition available. + Details
Name: | pfg_RealEstateInvestmentAccumulatedDepreciation
Namespace Prefix: | pfg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RealEstateInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration